Fix issues with previous commit

libcorpus2/io/cclreader.cpp

libcorpus2/io/cclreader.h

libcorpus2/io/fastxces.cpp

libcorpus2/io/fastxces.h

libcorpus2/io/reader.cpp

libcorpus2/io/reader.h

libcorpus2/io/rft.cpp

libcorpus2/io/rft.h

libcorpus2/io/xcesreader.cpp

libcorpus2/io/xcesreader.h